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Question 3
To make a saturated solution, 36 gm of sodium chloride is dissolved in 100 gm of water at 293 K. Find its concentration at this temperature.


Solution

Be careful about calculating the mass of solution as we always have to take the sum of masses of solute and solvent to calculate the mass of solution.

Mass of sodium chloride (solute)  =   36 gm
Mass of water (solvent)                 =   100 gm

Mass of solution                           =    36+100  =  136 gm
Concentration = (Mass of soluteMass of solution)×100
Concentration = (36136)×100=26.47%

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